Bulb



FIG. 1 is a perspective view of a bulb showing my new design;

FIG. 2 is a front elevational view of the blub;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing of the top and bottom portion is included for the purpose of illustrating only and forms no part of the claimed design. 

CLAIM The ornamental design for a bulb, as shown and described. 